Calculating machine



April 115 "1924. I v 1,490,129

' j A. F. lPOOLE CALCULATING MACHINE Filed Jan. '7, 1922 4 sheets-sheet1 tuning;

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, HlE ATTE RNEY April 15 1924. 1,490,129

, A. F. POOLE CALCULATING MACHINEIl l Fued Jan. 'f 1922 4 sheets-sheet2.

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A. F. POOLE GALULATINGMACHINE Filed Jan. 7, 1922 4 Sheets-Sheet 3'WWNEEEIEE *1m/'Emma- I .H15 TTURNEY April 15 1,924'.

, A. F. POOLE CALCULATING MACHINE Filed Jan. '7, 1922 4 Sheets-Sheet 4w|TNE55E L NVENTUR f f QM ML NM@ aga-6 l5 ATTURNEY citizen ofthe UnitedStates, and resident of y Patented Apr. 15, 192.4.

UNITI-:n s'rArEs ARTHUR F. POOLE, AOils" KENILWORTH, ILLINOIS, ASSIGNORTO REMINGTON ACCOUNT- PATE-NT OFFICE.

ING MACHINE CORPORATION, OF NEW YORK, N. Y., A CORPORATION 0F NEW- YORK.

CALCULATING MACHINE.

Application filed January 7, 1922. Serial Nb. 527,605;

To kall whom t may concern.' l

Be it known that I, ARTHUR F.- POOLE,

Kenilworth, in the county of Cook and State of Illinois, have inventedcertain new and useful Improvements in Calculating Machines, of whichthe following is a speci ication. Y

My invention relates to calculating ma` chines, and especially tocalculating machines capableof giving the algebraic total resulting froma series of additions and sub tractions. One ofthe principal objects ofmy invention is to provide a clearance proof mechanism for algxbraictotalizers. My invention also inclu fles' certain improvements inalgebraic mechanism itself.

ToI the above and other ends my inven` tion consists in certain featuresof construction and combinations and arrangements of parts, all of whichwill be fully set forth herein and particularly `pointed out in theclaims.

In the present instance I have shown my invention Yapplied to that formof the Remington accounting machine which includes across footer andwhich is shown and described in the patent to John C. Wahl, No.1,270,471, dated June 25, 1918.

In the accompanying drawings,

Figure 1 is a partial conventional front elevationfof a Remingtonmachine of the kind above mentioned, with my improvements appliedthereto.

Figure 2 is a-fragmentary detail view of the algebraic totalizer invertical section substantially on the line 2, 2 of Figure 5.

e FigureB is fragmentary lisometric view of a part of the crossactuator.

Figure 4 isla fragmentary top plan view of a portion of the clearanceproof mechanism, partly sectioned away.

Figure 5 is afriglit-hand side elevation of the algebraic totalizer withthe side plate removed an'd shows fragments of some of the associatedparts. l

Figure 6 is a top view of said totalizer in Section on the line 6, 6 ofFigure 5.

Figure 7 is a front to rear verticalvsec.- tion through said totalizer'on the line 7, 7 of Figure 6.-

Figure 8 is an isometric view of someof the principle of the clearanceproof mechamsm. v

Figure 10 is a right-hand side elevation, somewhat diagrammaticallyillustrating 'the clearance proof mechanism. l

Figure 11 is an isometric view of part of the totalizer.

y Figure 12 is a diagrammatic view of the two dial .wheels at the leftends of the respective series of dial wheels. -v

Figures 1, 8 and 4- are on a smaller scale than` the remaining views.

The Remington accounting machine is so well known and the calculatingmechanism of it is so well described in the Wahl patent above referredto, that I. have illustrated only those fragments of the machine whichimmediately co-operate with the present vinvention. Said machineincludes a Remington typewriter having mounted on its stationaryframework the stationary framework of the Wahl calculating mechanism,the latter including a cross bar 15,a fragment of which is shownin Figs.1 and 4. A main truck, not shown, is supported at the middle of thelmachine on wheels journaled in said cross bar on frame-piece 15, and atpaper carriage of the typewriter, and on said truck may be mounted anydesired number of vertical orcolumnar totalizers 16 and dummiesr17, thelatter lconsisting of a frame similar to that of a totalizer 16, butdevoid' of calculating mechanism. The machine also includes a crosstruck 18 adaptedV to reciprocatev to the extent of asingle computingcolumn, said cross truckrhaving a hook 20A and a co-operating stop-piece21, pivoted to the truck at 22 and adapted, when the carriage comes intoan adding zone in traveling from right to left, to engage with a lug 23constituting a part of the righthand frame lplate of one of thetotalizers 16 or dummies 17, so that thev truck shall be picked'up bythe lng. The cross truck 18 .is drawn toward the right by a spring andvit normally occupies its right-hand position,

and in said positionthe stop-piece 21 is 'depressed out of .thepath ofthe lugs 23, but

the hook 20 stands in the path of said lugs.

' Vhen the carriage is moved towardA the left these lugs successivelypick up said hook and draw the cross truck toward the left andas soon assaid truck begins to move, the stop 21.risesI to the position shown inFig. 1. At the end of a movement equal to the width of a computingcolumn the hook 20 and stop 21 are cammed down out of the path of luf,v23 and the cross truck immediately jumps toward the right ready to bepicked up by the same or some other totalizer or dummy.

The frame-piece 15 has secured to the right-hand art thereof thestationary framework of) the cross footing mechanism, which frameworkincludes amon other things a vertical end plate 24, a paral el plate 25,and a cross rod 26, Fig. 3, connecting said lates. A lever 27 ispivoted' at 28 to the ate 24 and it is normally pressed ,towar the leftby a spring 30. The truck 18 has an Vadjustable sto bar 31 which whensaid truck jumps bac toward the right is adapted to strike the upperpart of the lever 27 and press it back against the plate 24 and saidtruck is thus arrested. This lever 27 is not only art of the stop forlimitin the right-hand) movement of the cross truc but it is also a partof a locking mechanism which is fully described in the Wahl patent abovereferred to. Said lever has articulated therewith a long link 32 whichis connected with the locking mechanism in the manner described in saidpatent. Said locking mechanism also includes a roller 33 indicated bydotted lines in Fig. 1, which roller is normally held up by a spring butis adapted to be depressed whenever one of the vertical totalizers ordummies passes over it, each of said totalizers and dummies having acertain track-way 34 mounted thereon for the urpose. The mechanismincludes the usua numeral keys of the typewriter, which keys areconnected with the Wahl actuator and which actuator includes a certainrocker or universal bar. The mechanism is so designed that when theroller 33 is depressed by a totalizer or dummy and the lever 27 is'pressed back against the plate 24, then said rocker or universal bar islocked to warn the operator that he has got the carriage in an addingcolumn but has not hooked up the p cross truck, so that if the keys wereo erated the number would not be accumulate in the cross totalizer. Thislock is thus referred to because I use it in connection with my clear-Wahl totalizer.

Thus the rear parte of said plates 36 are made with the usual dove-tailformation so that they fit over the dove-tail cross truck 18. A rockshaft 37, having a. linger piece 38, is pivoted in said frame platesprecisely as in a Wahl totalizer, except that for reasons that willhereinafter appear, said fingen piece is not at the extreme right-handside of the totalizer. Said shaft has on it a pair of hooks 40, whichhook over the truck 18 and one of which is provided with a tooth 41working in a notched plate 42 secured to the front face of the crosstruck 18. A rod or shaft 43 is secured at its ends in the plates 36 bymeans of screws 44, Fig. 2, and on said shaft are journaled any desirednumber of carrying wheels 45. As here shown these wheels are identicalin construction and -location and function with the carrying wheels of alVahl totalizer. They are adapted to mesh with the cross master wheel 46which drives them, and they carry each to the next of higher order bymeans of Geneva wheels 47 mounted on levers 48, which levers are pivotedon cross bars 50 and 51, these levers 48 extending down below thetotalizer at the rear thereof into position to be operated by theregular Wahl auxiliarymaster dog 52. lVith certain exceptions which willbe mentioned hereinafter these levers are identical 'in construction,function and mode of o erapivoted in the side plates 36 at 56. Said.

levers are controlled by sprin s 57 connected to cross `rods 58, theseparts eing substantially like parts of the Wahl machine. Stationary bars60 extend across the totalizer in position to align the Geneva wheels 47whenever the latter are lifted out of engagement with the carryingwheels 45. The carrying wheels 45 drive a set of intermediate gears 61journaled on a shaft 62 sup orted by the side lates. 36. These whee aremade larger t an the intermediate gears of an clrdinary Wahl totalizerand have twenty teet In order to provide for algebraic calcula tionthere are two sets of dlals or numeral wheels, an upper set 63 forpositive numbers and a lower set 64 for negative numbers, said wheelsbein journaled respectively on cross rods 65 and 66. The individualdials may be of the usual Wahl construction except that the lower dials64 have the numerals arranged thereon in an order the reverse of thatused on the ordinary totalizer. Each of the dials 63 and 64 has a inion67 mesh-V ing with one of the intermedlate gears 61, so that each ofsaid ears drives two dials, one of each set of dials.

As is well known, the direction of rotaloo tion of the master wheel 46can be reversed,

said wheel turning in the direction of the arrow in Fig. 3 for addition,and in reverse direction for subtraction. The reversal of this masterwheel can be effected either manually or automatically, the automaticmeans including certain subtraction cams 68 mounted on the verticaltotalizers 16 and dummies 17, and a follower roller 7() mounted on anarm 71 and normally pressed up by a spring but adapted to be vdepressedby said cams. In Fig. 1, the machine is shown arranged for work on aledger sheet in which debit items are added into' the first totalizer 16and into the cross totalizer 35; credit items are added into the secondtotalizer 16 and subtracted in the cross totalizer; the new balance iswritten in the' field defined by the left-hand dummy 17 and subtractedfrom the cross totalizer, and the old or pick-u balance ,is written inthe column define by the right-hand dummy 17 and added into the crosstotalizer. This arrangement is shown merely by way of illustration, asmany other arrangements can be used.\ the amounts subtracted from thecross total.

It sometimes happens that izer exceed the amounts added in it. Forexample, if the machine is working on bank ledgerl sheets the depositormay check out more than he has on deposit; In that case the crosstotalizer 35 should show an overdraft, and it is inorder that thisoverdraft may be represented by plain ligures that can be copied on tothe paper inthe third column that an algebraic totalizer is desirable onthis particular piece of work.

` l shall not go into any extended discussion of the principle of analgebraic totalizer, this being well understood, and the generalprinciple of the particular one shown in the drawing is also well known,cross totalizers of construction similar in many respects to thepresentone being fully shown and described in certain rior patents of mine,such for example, as atent: 1,296,118 dated Mch. 4, 1919 and 1,801,818dated Apr.

22, 1919, In some respects the present in-A vention maybe considered asin the nature of' an improvement on the cross footers shown in my priorpatents and in other respects it may be considered an extension oi theinvention set forth in said. patents,

said extension consisting in the addition-'tc' the cross totalizer ofclearanceproof mechanism to be hereinafter described.' Suffice it to sayfor the present that so long as the total indicated on the totalizer 35is positive it can `be read from the upper series of dials 63 and whensaid total is negative it can be read from the lower series of dials 64.

Algebraic totalizers are preferably provided with shutters and I haveshown herein two such shutters. The shutter 72 'for the wheels 63extends across the said series conceal thewheels and has also openings73 adapted to yalign with the sight-o enings 7 4 in the casing plate 75of the totarizer so as tofallow the wheels 63 to be read. The clindrical part of the shutter is supporte by two end plates 76pivotedc'i; the shaft 65. The othershutter 77 has similar sight-openings73 adapted on occasion to align with the sight-,opening 78 for thewheels 64 and said shutter has end plates 80 pivoted on the shaft 66.

In order to shift the shutters 72 and 77 and in order to insert thefugitive 1 which it is necessary to add or subtract when thetotalizer'passes throu h zero, a handle or lever 81 is provided. ispivoted on the shaft 62'and it projects from the front of the totalizerthrough a slot 82 in the .,casing. The construction is such that whenthis handle is moved from itsy upper to its lower position it shifts theshutters to'conceal the negative dials 64 and to eX ose the positivedial 63 and this motion o the lever also adds 1 (positive) into thetotalizer; and when the handle is moved from its lower to its upperposition it reverses the shutters and subtracts 1 in the totalizer. Theprecise construction of this lever can vbe varied but'as here shown themain part of it is made of sheet metal and it has mounted thereon atriangu' lar piece 84 which is rigidly connected with the lever 81 bymeans of three posts 85, 86 and 87, the first two forward-of the shaft62 and the last behind said shaft, The piece`84, as well as piece-81, ispivotally his lever mounted on the shaft 62. The right-handvice versa.The sight-openings in the upper shutter 72 are in the lower or forward.part of the shutter and in the lower shutter 77 they are in the upper orrear part as shown.

The fugitive 1 is inserted by devices operated by the pin or post 87.The part .immediately operated by said post .is a struc-k ture includinga hub 88, Fig. 2, journaled on the right-hand end of the rod 48. Thishub has rigidly mounted thereon an outer plate 90 4and an inner plate 91and it has va reduced part on which is loosely' pivoted athird plate 92.

The plates 90 and 91 are rigidly connected` at their lower parts by apost /93 having its ends reducedand riveted into said plates as showninFig. 2. The plate 9,1 has an arm extending upward and forward andbifurcated to uembrace the pin 87, tlus interlock ing this pivotedstructure with the lever 81 vso that said structure rocks with the lever81 but in the opposite direction. Said plate Y 91 also has an arm ornose 94 extending upward and rearward-and co-operating with a V-shapedpoint or nose 95 on a lever 96, which is ivoted on the frame rod 50 andis controlled) by one of the springs 57 and cooperates with one of thestop screws 54, the same as the ordinary transfer levers 48; but thislever 96 does not extend downward into position to be operated by themaster dog 52. It is on the contrary operated by the nose 94 which isrounded for the purpose. The construction is such that the springpressed lever 96 will retain said nose 94 and consequently7` the plates91, etc.,and the hand 'e lever 81 in either of the two positions towhich they can be set; but when force is ap lied to the lever 81 thelever 96 will yield and allow the parts to move to their alternativepositions. l

The plate 92, which is loosely pivoted on l the hub 88, has twodepending arms spaced apart as' shown andembracing the post 93 but withlost motion so that said plate 92 is obliged to partake ofthe swingingof the plates 91 and 90 but has a limited motion independently thereof.This plate 92 has a nose or cam part 97 which lies by the side ofthe-nose 94, the end ofsaid cam part being concentric with the shaft 43,and of a suitable length for the purpose about to be described.Co-operating with this nose 97 is a nose 98 formed on a plate 100 lyingbeside the lever 96 and riveted thereto at'101 and thereforeconstituting in effect a thickening of a part of said lever 96, theeifect being to thicken said lever so that its nose can co-operate notonly with the part 94 but also with the part 97. Beginning with theparts in the position shown in Fig. 5, if the handle 81 be moved upward'the noses 94 and 97 will move toward the front of the machine. Thelever 96 will be cammed upward by the arm 94 but once elevated it willnot immediately drop because the nose 98 will be held up by the camdwell 97 until the lever. 81 has almost completed its motion, when thenose 98 will pass off of the dwell 97 and will cam the nose of plate 92towards the front oi?` the machine. As this plate is loose on the hub itwill move quickly and allow the lever 96 to be drawn down by the spring57 with a snap. The construction shown in my prior Patent 1,301,318 hasdevices similar in principle to those just described and the function ofsaid devices is explained in said patent.

It will be perceived that the relation of the lever 96 and the nose 94is such that said lever 96 holds the plate 91 firmly at the limit of itsmotion in either direction.

In order to adder subtract 1 whenever the lever v81 is operated there isprovided between the plate 91 and the units carrying wheel 45 a gearsegment 102, Fig. 2, and this segment has two pins 103 projectingtherefrom one on each side of the arm 94.- but spaced apart so that .thedistance between them is greater than the width of said arm. When thehandle 81 is in its lower position said arm 94 presses the rear in 103firmly against a stationary pin 104, Figs. 5 and 6, projecting inwardfrom the righthand frame plate 36 and thus holds the segment 102 in theposition shown in Fig. 5. When the handle 81 is pulled upwardthe arm 94moves toward the front of the machine and during the first part of itsmotion it does not operate the segment 102 but in the last part of itsmotion it engages the forward pin 103 and moves it toward the frontefthe machine until arrested by another fixed pin or post 105, alsoprojecting inward from theplate 36. Said arm 94 will be firmly held inthis position by the lever 96. The segment 102 has on its upper part aseries of gear teeth corresponding in position and pitch to some of thegear teeth of I the carrier gears 45 and the construction is such thatan operation of the handle 81 moves said segment to the extent of onetooth, in positive direction when the handle is moved downward and innegative direction when the handle is moved upward. The motion of thesegment 102 is communicated to the units wheel 45 by means of a Genevapinion 106, Figs. 2 and 5, in all respects like the ordinary Vahltransfer pinions and mounted like them on one of the levers 48. ThisGeneva pinion has the usual scalloped middle part of greater diameterthan the gear-toothed part land this enlarged scalloped portion isfunctionless except that it co-operates with the aligning bar 60 when`the pinion is raised out of engagement.

I have shown the algebraic totalizer 35 occupying the position of thecross totalizer in the lVahl mechanism. In the lVahl machine, thevcross-totalizcr is usually freed from the vertical totalizer in thatstep of the carriage which immediately follows the writing of the digitin the lowest denominational position, and said ttalizer is free of themaster wheel 46 when it occupies its normal righthand or jump-backposition. When the handle 81 is operated it operates thelowest registerwheel and this' may result in carrying through to wheels of highestorder. This handle should therefore never be operated when the totalizeris in engagement with the master wheel. To prevent it from ever being sooperated I have provided means for locking the handle 81 except when thetotalizer is in its'right-hand position free of the master wheel. Tothis end the plate 90, which it will be recalled is positively'connected with the handle 81, is prolonged soas to form a rear stopsurface 107 and a front stop edge 108, and these surfaces or edgesinterlock with a flange 110 carrying lwheel 45 of neXt'lower order thanthe one engaged at the time by the master wheel.Y The flange 110constitutes asort of continuation of the locking tooth 116 but at alower level so that said flange does not lockthe carryinggears 45 butdoes prevent motion' of the plate 90 and consequently of the handle '81.The two stop surfaces 107 and 108 are so disposed that when the handle81 is in its lower position the stop surface 107 will ride just 1n frontof the iange 110-as shown in Fig. 5 and Ywhen said handle is in itsupper position the edge 108 will ride just behind said flange as shownin broken lines in said figure. In either `event once the plate 90 getsinto engagement withthe fiange 110, as it.does whenever .thetotalizer isin engagement with the master wheel, the handle 81 cannot be shifted.Said flange terminates at 118, Fig. 3, so that whenthe totalizer is inits right handf'position where it is out of engagement with the masterwheel, the handle 81 is free to be operated. This locking mechanismisone ofthe novel features of the presenty in-l vention. A

' In order to notify the operator-when to shift thehandle 81 vI havemade the highest register dials of peculiar construction. In some `prioralgebraic totalizers it has been "deemed suilicient for this purposemerely to number said dials like any other dials, the

.o erator understanding that the highest dial s ould never show anynumber except 9 or zero, and that if said dial shows -zero the registerwill give t-he true reading, and if it shows 9, then it needs to beshifted to read from the other series of digits of opposite sign. In thepresent case I utilize the position of .the highest dial for the samepurpose but make the change more conspicuous by using certain colorsinstead of the digits and I have also made this dial wider than`thefrest so as to make the spot of color still more conspicuous. Thiscolor scheme is dianietrically illustrated in Fig. 12 where 563!vrepresents the left-hand dial in the series 63,l` and.v 64 representsthe corresponding dial'finthe lower series 64. In this diagram74?in'dicates theupper sight opening and 78the lower sight opening. Theupper dial 63 when thetotal ispositive shows a black spot 120 at thesight opening, and just above this is a red spot 121 which will beexposed when a number is` subtracted greater than the 'previous positivetotal. The balance of the circumference of the wheel 122 is coloredgreen.- On the lower dial the red spot. 123

is beneath the black spotI 124 and the re mainder 125 of thecircumference of thel wheel is colored green. The construction is suchthat when thereis a positive total on the register the red spot l123should register` with `the sight opening; and when there is anegativetotal ,the black spot 124 should register with the sight opening. Itwill of course be understood that only one of the two sight openings ata time is uncovered. The whole construction is such that when theoperator glances at thetotalizer and oh serves a black spot, heunderstands that the handle does not have to he shifted, but` if theldial shows a red spot, then the handle should be shifted in order toread the correct total.V In case the dial shows green, this is anindication that the capacity of the register has been exceeded in onedirection or the other; in other words, that the machine has beenincorrectly operated. It will of.

course, be understood that black, red and green are given only asillustrations-any desired'colors can be used.- Preferably, however, thezero position of each dial is of the same color as the totalizer casing(Wahl totalizers are usually japanned black).` so

that, when the right set of dials are exposed to View, the highest dialis inconspicuous.. When the totalizer passes through zero, this dialchanges to expose a spot of color (as red) contrasting with. the sur-vrounding parts and, therefore, adapted to attract attention.

These dials 63a and 64L are driven exactly like the other dials but itis not intended that they ever be operated except by a transfer from thenext lower carrying wheel 45. The Geneva pinion that serves this wheelis therefore mounted on a special arm 126, Fig. 6, which does not have adown* ward extension adapted tol cov-operate .with the master dog 52.

It -will be understood that in the 4Wahl machine some of these arms 48extend lower than others, as shown vin Fig. 5, and that where there is along arm this resul-ts in looking the machine against operation in thenext letter space position above that occupied, by said arm. The meanswhereby this locking takes place is well-known in the Wahl machine wherethe common use of itris to lock the machine against operation in thosff:letter space positions that are devoted to punctuation points. Thatlever 48 which stands'just to the right of thelever 126, may be made ofthe long kind so aste pnewent operation of the keys in the positionoccupied by the lever 126.,

Clearance .proof mechanism for an algebraic tot-alizer of the kindlherein described 'must of necessity diflerl from that which isapplicable to an ordinary'totalizer, for the reason that positive zeroand negative zero correspond to different positions of the gearing. Whenone of the dials 63 has its zero registering with the sight opening thecorresponding dial 64 has the 9 registering with the sight opening and,vice versa, when one of the dials 64 has its zero on the reading linethe corresponding dial 63 has a 9 on the reading line. What is the zeroposition of the gearing therefore depends on which set of dials is underconsideration. In providing mechanism, such, for example, as feelermechanism to test the state of the totalizer as to clear or not clear itis therefore necessary to provide some selective scheme to distinguishbetween the two kinds of zero. Mechanism having this selective power orproperty can be constructed in different ways but so far as I am awarethe present is the first instance of any selective clear testingmechanism adapted to show clear whether the reading is from the positivenumerals or from th nevative numerals. 1

n the specific form of the invention shown in the resent ease, theselective clear proof or c ear testing mechanism cooperates with theintermediate gears 61, which are for that reason provided with a numberof teeth equal to some multiple of 10, 'twenty teeth being shown on eachof these wheels in the present instance, Each of these wheels isprovided with two short teeth' 127 opposite each other and thereforespaced ten teeth apart. When the computing train is at positive zero,one of these teeth 127 stands in the position shown in Fig. 10, and whenthe train is at negative zero it stands in the position shown in Fig. 9.If, therefore, a feeler, as 130, is to be used to test the state of thisgear train it should, when a positive zero is under consideration, acttoward the wheel 61 along the line 131, Fig. 9, whereas when the saidfeeler is to test the state of the gear train as to a negative total. itshould act along the line 132. In the Wahl inzachine zero is' obtainedby copying the total from the register wheels and substracting eachdigit from itself in the act of writing the digit. When copying apositive total the handle 81 would be in its depressed position, shownin Fig. 5, and at this time,

therefore, in order to test the clearance of the totalizer, the feelershould move up at the end of the operation along the line 131. When thetotal is negative the handle 81 would occupy its upper position, thegearing would be reversed so as-to enter the total positively into themachine, which would have the effect of subtracting it from itself asindicated on the dials 64. In order to test whether these dia-ls havecome to zero the feeler should act along the line 132. I haveaccordingly provided a feeler 130 which is shifted by the handle 81 insuch fashion that when the handle is in its lower or positive positionthe feeler acts along the line 131, and when the handle is in its upperposition it acts along the line 132. Said feeler mayconsist of a seriesof arms but in the present instance I have shown it as a bar lying belowthe gears 61 and pivoted near its lower edge 'at 133 in two aims 134 and135 fixed on theends of a rock shaft 136 which is pivoted at its ends inthe frame plates 36. The feeler bar 130 has a convex edge which ispressed against the gears 61. In Fig. 11 I have shown part of the upperedge of this bar cut away at 137 to avoid interference with the dials64, leaving, however` ribs 138 of cylindrical outline in position tocontact with the gears 61.

The arm 135 is broadened out into a pla-te having the outline shown anda pin 140 projecting from the right-hand end of the feeler 130 plays ina slot 141 in said plate, the ends of which slot may limit the swingingmotionof the feeler about its pivot 133. As best shown in Figs. 5 and11, the plate-like inner end of the lever 81 extends down between theend of the feeler bar 130 and the plate 135 is made with a. slot 142which embraces the pin 140 so that when the handle 81 is down in itspositive position said feeler is swung to the position shown in Figs. 5and 10 and in broken lines in Fig. 9, and when said handle is raisedto.-its negative position said feeler block is swung over to theposition ,shown in full lines in Fig. 9.

The cylindrical edge of the lfeeler bar 130 has its cylindrical axis at143, Figs. 9 and l0, intermediate between the pivot 133 and the edge ofthe bar. The parts are so proportioned that when the handle 81 is in itspositive position the point marked 143 a short tooth 127 is in the line131, and if in the second instance said short tooth is in the line 132,then the feeler can move upward further than it can if a long tooth isin the line, and this additional upward motion indicates that thetotalizer is at positive or negative zero as the case may be. The plate135 and associated parts are shown in Fig. 10 by full lines in positionto indicate a positiv-e zero and in broken lines in the positions theywould occupy if one of the gears 61 `had. a long tooth in position toarrest the feeler, indicating that the corresponding dial was not atZero.

This selective feeler mechanism can be made to lgive a clear or notclear indication in a variety of ways. ln thev present instance I haveshown it co-operating with a clearancepproot mechanism which is fullyshown, described and claimed in my pending application Serial No.462,626, filed April 19, 1921.y The plate 135 has a 1in er 144 whichoverlies one arm of an ang ed lever 145 whichv may conveniently bepivoted on the post 105 hereinbefore described, which post issoconstructed as that the part et it next the frame plate 36 acts as apivot for said lever, and a prolongation Aof said vpost may yact as astop for the pin 103,

as will be seen by reference to Fig. 2. The upward arm of the lever 145has a pin 146 to whichis 'p'ivoted the forward end of a link 147, therear end ot w-hich is pivoted at 148 to a lever or trigger 150, thelower end of which is pivoted on the frame rod 51just inside the frameplate 36. The pin 146 is prolonged inward, as shown in Fig. 6, and hasconnected thereto a light spring 151, the other end of which isconnected to a fixed part, as for example, one of the bars 60, tonormally pull the lever 145 clockwise in Figi 5 and to move the feeler130 upward into engagement with the gears 61. The upper end Iof thelever or trigger 150 projects through the top of the casing 75 where aslot 152, Fig. 7 is made for the purpose, said s lot preventing motionof the lever in a. right and lefthand direction but allowing it alimitedl motion front and back.

It will be perceived that the whole construction is such that when theeeler 130 is in its elevated position, indicating that the totalizer is-4clear, the lever 150 will occupy its rear position shown in full linesin Figs. 5Yand 10; and when said feeler is depressed, indicating thatthe totalizer is not clear, then said lever 150 will occupy the forwardposition shown by broken lines in Figs. 5 and 10. The trigger 150co-operates with an arm 153 of a three-arm locking lever which ispivoted at 154 to a frame plate 155 secured4 to the end plate 24 of thestationary framework. The lever 153`eXtends left ward from the pivot 154and at its free end has a'giooved pin 156 which plays in a slot 157' teprevent deliection of the lever arm front and back and which allows saidlever arm to swing up and down. Near its free end said lever. arm has aninclined edge 158. This lever arm 153 is so situated that when thetrigger 150 is in lits rear position indicating a clear totalizer itsflat upper end is in the plane of said lever arm as indicated in Fig. 5,but when said. trigger occupies its forward position indicating notclear it is out of the plane of said lever arm. At certain times in the.operation Lof the machine said lever arm 153 drops downward and locksup the machine, as will be presently explained. It at this time thecross truck 18 and totalizer 35 make their jump to the right at the endof the column, then the upper end of trigger 150 will strike the.incline 158 and raise lever arm 153 to its unlocking position; whereasif the totalizer is not clear said trigger will not strike said leverarm and the machine will remain locked.

ln order to enable the locking lever to lock the machine it is providedwith a depending` arm 160 having a lug 161 bent olf therefrom andadapted to engage the lever 27. When the locking lever is held up in itsnormal position shown in Fig. 1 it has no effect on this lever 27, butwhen it is dropped down to its locking position the lug 161 presses thelever 27 back against the plate 24 and locks up the machine precisely asthe cross truck would if it were lleft in its right-hand position" whenthe main truck was in a computing column. The details of this lockingmechanism are not here shown or described, -they being fully shown anddescribed in the Wahl patent hereinbetore referred to. Moreover, anyother suitable lock operated by this lever might be employed itpreferred.

In order normally to hold the locking lever 153, 166 in its unlockingposition and to release it to lock the machine at suitable times, saidlever is provided with an upwardly extending arm 162 having a lug 163bent rearward from its upper end and engaging a notch .in a latch lever164, which latch lever is pivoted at 165 to the frame piece 155. Atension spring 166 connects the arm 162 with a depending arm otthe latchlever 164, this spring performing the double function of normallyholding the latch lever in engagement with the lug 163 and, when saidlatch lever is unlatehed, ot moving the locking lever 153, 160 tolocking position.

ln order to release the latch lever 164 at certain times said lever isprovided with an upright arm adapted to he pushed tothe right by a longwire 16T which is guided in a hole in an ear 168 bent oit from the frameplate 155. This wire or push bar 167 extends leftward t0 the middle ofthe machine where its left-hand end is pivoted 'a flanged plate 172secured to the casting or trame bar 15 by screws 173. The lever 170 iceis in the nature of, a bell crank which in order to secure a long pivot,is formed as shown in Fig. 1 sol as totake a bearing both at the upperend and at the lower end of the post 171 and said bell crank has aleftwardly directed arm 174 toV which a dog 175 is pivoted at 176. Saiddog has a pin 177 projecting therefrom and .engaging the edge of leverarm 174 soas to limit the rotation of said dog about its pivot 176 vinone direction. Said pin is normally pressed against said lever arm bymeans of a spring 178.-

The do 175 and the lever 174, 170 are operatedl y means of a tappet 180consisting of a flange bent off from the end of a bracket 181 secured toand projecting toward the right from the second or left-hand one of thetwo dummies 17, said flange or tappet 180 engaging an inclined edge ofthe dog 175'as shown in Fig. 4. The construction is such that when thecarriage is moving toward the right trappet 180 will engage the abruptedge of the dog 175 and rock said dog idly about its pivot, the d ogbeing restored to normal position by its spring 178 after the tappet haspassed it; but when the carriage is traveling towards the left said dogcannot rock in that direction on account of its stop pin 177, and thetappetengaging the inclined edge of the dog will rock the lever 174,170against the tension of a restoring spring 182 and push the wire or bar167 toward the right, releasing the locking lever 153, 160 and lockingup the machine. In the present instance the parts are so arranged andproportioned that the locking lever 153 is thus tripped off during thatstep of the carriage which immediately follows the writing of the lastdigit in the calculatin column controlled byv the lefthand dummy 17. Itwill be recalled that in the particular machine arranged in theparticular manner shown in the drawing it is at this time that the crosstotalizer 35 should have just come to zero, due to the copying lout ofit of the new balance which had been .computed in it. In this sameletter space step of the carriage, the -hook 20 is cammed loose from thedummy and the cross totalizer makes its jump to theriglit. If the workhas been correctly done and the cross totalizer is clear as it shouldbe, then the lever 153 will drop to locking position and will almostinstantly be restored by the trigger 150; but if the work has beenincorrectly done and the totalizer has not been cleared, then saidtrigger' 150 will not engage the lever 153 andthe machine will remainlocked and the operator will thus be notified that a mistake has beenmade.

What I claim as new and desire to secure by Letters Patent, is

1. The combination with register wheels, of means for testing theposition of said wheels, comprising a feeler pivoted to swing about anaxis 133 remote from said wheels and having its feeling surface in theform of part of acylinder whose axis 143 is between the pivot 133 andsaid wheels, whereby said feeler can be swung about its pivot 133 tobring said axis 143 into di'erent planes radial of said wheels, saidfeeler being bodily movable toward and from said wheels.

2. In an algebraic calculating machine, the combination with registerwheels having positive and negative numerals, a handle, shuttermechanism operated by said handle to display a positive or a negativetotal as the case may be, and lmeans operated by said handle to insertthe fugitive 1, of clearance proof mechanism settable by said handle totest for positive or negative zero as the case may be.

3. In a calculating machine, the combination with algebraic calculatingmechanism, of a lock to indicate not clear, and means forcontrollingsaid lock selectively as to positive and negative clearance.

4. The combination with register wheels capable of giving positive andnegative totals, of clearance proof mechanism, and

hand operated means for at will setting said mechanism to prove positivezero and to provide negative zero.

5. The combination with register wheels and two sets of dials, one setfor positive totals and the other set for negative totals, of a handle,movable to two positions, shutterA mechanism operated by said handle,means operated by said handle for inserting the fugitive 1, andclearance proof. I

mechanism shiftable by said handle.

6. The combination with register wheels, of a. movable frame, a feelerpivotallyl mounted in said frame, means for moving said frame to presssaid feeler against said wheels, and means for shifting said feelerabout its piv'ot in said frame to change the points on said wheels atwhich said feeler enga-ges said wheels.

7. In an algebraic calculating machine, the combination with registerwheels and a master wheel having relative travel, of hand o erated meansfor inserting the fugitive 1 and a. locking bar bearing a fixed relationto said master wheel and preventing operation of said hand-operatedmeans when any of said register wheels is in engagement with said masterwheel.

8.' The combination with an algebraic totalizer and a master Wheelhaving relative travel, of a handleA in said totalizer for inserting thefugitive 1, and a lock for preventing operation of said handle when saidvout of engagement but being adapted to be reciprocated one across theother a plurality of times for a single traverse of said carriage, of adevice in said totalizer shiftable for a positive total and for anegative total, and a locking bar to prevent the shifting of said deviceexcept when the totalizer and master wheel are in their normaldisengaged relative positions.

11. In algebraic calculating mechanism, a dial and means for operatingsaid dial, said dial showing one color when the mechanism stands at apositive total, another color when said mechanism stands at a negativetotal, and a third color when the capacity of said mechanism has' beenexceeded.

12. In algebraic calculating .mechanism having a casing, a dial andmeans for operating said dia said dial showing the same color as saidcasing when the mechanism stands at a total of one sign, said dialshowing a contrasting color when said mecha@ nism stands at a total ofthe opposite sign, and said dial when the ca acit of said mechanism `hasbeen excee ed s owing a third color contrasting with both firstmentioned colors.

13. In an al ebraic totalizer having two sets of numera s, one forpositive andthe other for negative totals, an indicator adapted todisplay three colors, one color indicatrectly operated.

ing that the total may be read from one of said sets of numerals, asecond color to indicate Ithat the total shouldvbe read from the otherset of numerals, and a third color to show that the totalizer has beenincorl rectly operated.

14. In an algebraic totalizer, the combination with two sets ofnumerals, one for positive andthe other for negative totals, and shuttermechanism to display said sets of numerals alternatively, of an-indicator adapted to display three colors, one color indicating thatthe total may be read as displayed, another color to indicate that saidshutter mechanism should be shifted, and a third color to indicate thatthe totalizer has been incorrectly operated.

15. In an algebraic totalizer, the combination with two sets of dials,-one set to show positive totals and the other set to show negativetotals, and shutter mechanism to display said dials one set at a time,of two indicators, one associated with each of said sets of dials andeach adapted to display three colors, one color toindicate that thetotal may be read as then displayed, another color to indicate that saidshutter mechanism should be shifted, and a third color to indicate thatthe totalizer has been 'incor- 16. In an algebraic totalizer, thecombination with a` set of numeral dials, of anadditional' dialconnected by carrying mechanism to the dial of next lower order andhaving its zero position one color,.its nine position a second color,and the balance of its exposed surface a third color. Signed at boroughof Manhattan, cityv o New York, in the county of New York, and State ofNew York, this 6th day of Janu-v ary, A. D. 1922.

ARTHUR F. POOLE.

